Shock absorber and method and apparatus for assembling the same

Abstract From the Canadian patent

A vehicular or similar type shock absorber of the type including a cylindrically shaped housing member defining a fluid chamber, a piston assembly, reciprocally disposed within the chamber and a piston rod arranged generally coaxially of the chamber and, means operatively connecting one end of the piston rod to the piston assembly and including one end of the piston and projecting through an opening in the piston body and having a terminal end portion formed with an enlarged diameter head which is produced by engaging a tool moving along a generally cycloidal overlapping rosette pattern with the end portion of the piston rod for causing the material of the piston rod to flow generally …